encephalopathy vs brain disorder

encephalopathy and brain disorder both are nouns.

Word	Noun	Adjective	Verb	Adverb
encephalopathy	Yes	No	No	No
brain disorder	Yes	No	No	No

As nouns, encephalopathy and brain disorder are synonyms defined as:

Other synonyms of encephalopathy include brain disease.

encephalopathy (noun)	brain disorder (noun)
any disorder or disease of the brain	any disorder or disease of the brain